Revert "Add mutex around play queue"
Revert "Add mutex around play queue"

This reverts commit 0748a9e56801277b0838fc591737ff7d2c190129.

andribja/airhornbot,hammerandchisel/airhornbot,Mathboy19/airhornbot,Mathboy19/airhornbot,hammerandchisel/airhornbot,Mathboy19/airhornbot,NMisko/discord-bot,Mathboy19/airhornbot,hammerandchisel/airhornbot,andribja/airhornbot,andribja/airhornbot